Editing Rotary engine (section)

===Adams-Farwell===
{{Main|Adams-Farwell}}

[[File:Adams-Farwell Gyro Motor Rotary 5.jpg|thumb|right|An Adams-Farwell five cylinder rotary adapted for helicopter experimentation]]
The [[Adams-Farwell]] firm's automobiles, with the firm's first rolling prototypes using 3-cylinder rotary engines designed by Fay Oliver Farwell in 1898, led to production Adams-Farwell cars with first the 3-cylinder, then very shortly thereafter 5-cylinder rotary engines later in 1906, as another early American automaker utilizing rotary engines expressly manufactured for automotive use. [[Emil Berliner]] sponsored its development of the 5-cylinder Adams-Farwell rotary engine design concept as a lightweight power unit for his unsuccessful helicopter experiments. Adams-Farwell engines later powered fixed-wing aircraft in the US after 1910. It has also been asserted that the Gnôme design was derived from the Adams-Farwell, since an Adams-Farwell car is reported to have been demonstrated to the French Army in 1904. In contrast to the later Gnôme engines, and much like the later [[Clerget 9B]] and [[Bentley BR1]] aviation rotaries, the Adams-Farwell rotaries had conventional exhaust and inlet valves mounted in the cylinder heads.<ref name=nahum20/>